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Using scanning tunneling microscopy (STM), the common features and peculiarities of the Si(111)3x1 reconstructions induced by Na, Ag, Ca, and Mg have been studied. From the quantitative consideration of the Si mass transport occurring at the 7x7->3x1 transformation, the top Si atom density has been found, and it appears to be the same, 4/3 monolayer, for all surface structures under consideration...
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